|Publication number||US4001474 A|
|Application number||US 05/500,642|
|Publication date||Jan 4, 1977|
|Filing date||Aug 26, 1974|
|Priority date||Aug 26, 1974|
|Publication number||05500642, 500642, US 4001474 A, US 4001474A, US-A-4001474, US4001474 A, US4001474A|
|Inventors||Ralph F. Hereth|
|Original Assignee||Wilkins & Associates, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (12), Referenced by (25), Classifications (13)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention relates to honeycomb cellular structures utilized in so-called "sandwich" or laminated panel constructions in which outer facing sheets are laminated to each side of the cellular structure.
Cellular structures typically used in prefabricated wall panels are made up of continuous, corrugated or sinuous elements which form a honeycomb-like cell pattern in which each cell has a triangular or hexagonal cross section configuration. The triangular cell configuration is most desirable in many wall panel applications because it provides a rigid, truss-like core structure with greater rigidity, resistance to cell collapse and folding etc. than other cell configurations.
In a wall panel incorporating a triangular cell configuration one or both panel facing sheets usually are glued to the peaks or nodes of the corrugated elements. Inasmuch as these peaks or nodes provide a discontinuous gluing surface, the completed panel often has an undesirable appearance because the unglued portions of the facing sheets between the corrugation nodes tend to become warped.
Several structural materials which would be highly desirable as wall panel cellular core material are unsuitable for use in the continuous forming and assembly processes normally used to make corrugated cell elements. These materials must be formed by a noncontinuous process in which heat and pressure are applied in accordance with suitable cooling and/or setting times. One example of such material is high density cellulose fibres.
This invention provides a cellular structure having triangular cells and mutually opposed continuous gluing surfaces to which the panel facing sheets are secured without danger of deformation. The cellular structure is made up of individual cell segments which are interengaged with each other to form the desired cellular pattern. The cell segments may be fabricated individually from material which must be formed by the above-described noncontinuous process.
According to a preferred embodiment of this invention a cellular structure suitable for use as a honeycomb core in a "sandwich" panel construction is made up of a plurality of serially arranged, interengaged cell segments. Each cell segment includes a main body portion having a generally triangular cross sectional configuration and flat leg portion projecting from one tip of the main body portion parallel to the main body portion side opposite this tip. When a plurality of such cell segments are interengaged, these main body portion sides and the leg portions form substantially continuous outer surfaces to which respective panel facing sheets can be glued without danger of subsequent warping. While preferably the cell segments have generally equilateral sides, they may have unequal sides, if desired.
Other objects, features and advantages of this invention will become apparent in the detailed description to follow taken in conjunction with the accompanying drawings in which like parts bear like reference numerals.
FIG. 1 is a perspective of a panel incorporating the cellular core structure of this invention, with part of one panel facing sheet broken away;
FIG. 2 is a perspective of a cell segment of the cellular core of FIG. 1;
FIG. 3 is a cross section in expanded scale taken along lines 3--3 in FIG. 1;
FIGS. 4 and 5 are fragmentary cross sections generally similar to FIG. 3 in expanded scale.
The core structure of this invention may be used in a "sandwich" type panel construction illustrated in FIG. 1. The illustrated panel conprises cellular structure 10 generally rectangular in cross section for providing substantially continuous, parallel, outer surfaces 12 to which facing sheets 14 are secured by respective layers of adhesive or glue 16. The panel is useful in construction of prefabricated dwellings, housing modules, etc. and is adaptable to both indoor and outdoor environments by varying the material and surface finish of the panel outer facing sheets 14.
The cellular structure 10 includes a plurality of parallel, serially arranged, interengaged, elongated cell segments 18 which form a series of equilateral, generally triangularly outlined cells 20. In the example of FIG. 1, the cell segments extend longitudinally of the panel; however, they may extend transversely, if desired. The length of the cell segments corresponds to the lateral or longitudinal dimension of the panel as the case may be. Although the panels will normally be prefabricated, the cellular structure 10 may be assembled or disassembled at the construction site if desired. To this end, the cell segments are mutually self nesting so that they may be interengaged and assembled into the core structure 10 with minimum use of tools, risk and experience. The triangular cells 20 may be filled with suitable insulating material to provide added protection against noise, vibration, heat, etc.
As most clearly shown in FIGS. 2 and 3, each cell segment 18 is a monolithic plate-like member which is folded to form a substantially equilateral, triangular main body portion 22 and a flat leg portion 24. The main body portion 22 includes oppositely inclined left and right side walls 26 and 28 intersected at lower tip portions 30 and 32 by a bottom wall 34. The upper end of the right side wall 28 conforms to and is engaged with the underside of the upper tip portion 36 at the juncture between the latter and the leg portion 24. The left side wall 26 merges at the upper tip portion 36 with leg portion 24 which projects outwardly from the upper tip portion 36 parallel to the main body portion bottom wall 34. The leg portion 24 is of sufficient width that it extends to and engages the upper tip portion 36 of an adjacent cell segment, and preferably is of the same width as the bottom wall 34. The leg portion 24, right side wall 28, and bottom wall 34 together form a Z-shaped segment, the upper and lower outer surface of which provide the above-described mutually parallel outer surfaces 12 to which the panel facing sheets are secured.
The cell segments 18 are self nesting as they are interengaged. As best shown in FIG. 4, the lower main body tip portions 30 and 32 may be flattened so that they squarely abut against the lower tip portions of adjacent cell segments 18. These tip portions, of course, may be secured together by adhesive. Referring now to FIG. 5, the main body portion upper tip 36 forms a generally U-shaped recess 38 with which the end of the leg portion 24 of an adjacent cell segment 18 is overlappingly engaged, as shown (see also FIG. 3). Thus it will be appreciated that pressure applied generally perpendicularly to the illustrated panel sides forces the interengaged leg portions 24 and adjacent cell segments 18 into more positive engagement with each other. This lends additional rigidity to the composite core structure 10.
The cell segments 18 may be fabricated economically and at relatively high speed from suitable ductile materials. Examples of such materials are wood-fibre, sheet metal and plastic. However, to provide a core structure with improved structural characteristics, the cell segments may be fabricated from the above-described materials requiring noncontinuous forming.
While the preferred embodiment of the invention has been illustrated and described herein, it should be understood that variations will be apparent to one skilled in the art. For example, the panel may include only one facing sheet 14, or the facing sheets 14 may be eliminated by securing the cell segments to each other. Accordingly, the invention is not to be limited to the specific embodiment illustrated and described herein.
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|U.S. Classification||428/116, 428/188|
|International Classification||E04C2/34, B32B3/12|
|Cooperative Classification||Y10T428/24744, B32B3/12, E04C2/34, E04C2002/3477, Y10T428/24149, E04C2/3405|
|European Classification||B32B3/12, E04C2/34B, E04C2/34|